Global Patent Index - EP 1484825 A2

EP 1484825 A2 20041208 - Laser diode protection circuit

Title (en)

Laser diode protection circuit

Title (de)

Schutzschaltung für einen Diodenlaser

Title (fr)

Circuit de protection pour une diode laser

Publication

EP 1484825 A2 20041208 (EN)

Application

EP 04009128 A 20040416

Priority

KR 20030035274 A 20030602

Abstract (en)

A circuit for protecting a laser diode from an initial instantaneous surge current includes an upper voltage limiter (100) for applying a predetermined voltage to a laser diode (D1) and limiting the voltage not to exceed a predetermined level and further features a low-speed voltage increaser (200) for slowly increasing a voltage to be applied to the upper voltage limiter (100) by a predetermined time constant. For ATC (automatic temperature control), the laser diode protection circuit may further comprise a lower voltage limiter (300), a low-speed voltage reducer (400) and a second leakage current breaker (450). <IMAGE>

IPC 1-7

H01S 5/068

IPC 8 full level

H01S 3/00 (2006.01); H01S 5/04 (2006.01); H01S 5/068 (2006.01); H02H 9/00 (2006.01); H02H 9/04 (2006.01); H01S 5/022 (2006.01); H01S 5/042 (2006.01); H01S 5/0683 (2006.01)

CPC (source: EP)

H01S 5/06825 (2013.01); H01S 5/02208 (2013.01); H01S 5/042 (2013.01); H01S 5/0683 (2013.01); H01S 5/06837 (2013.01)

Designated contracting state (EPC)

DE FR GB

DOCDB simple family (publication)

EP 1484825 A2 20041208; EP 1484825 A3 20050525; CN 1574522 A 20050202; JP 2004363597 A 20041224; KR 20040103289 A 20041208; US 2004240133 A1 20041202

DOCDB simple family (application)

EP 04009128 A 20040416; CN 200310120448 A 20031215; JP 2004160495 A 20040531; KR 20030035274 A 20030602; US 68309003 A 20031010